// license:BSD-3-Clause // copyright-holders:Aaron Giles, Vas Crabb /*************************************************************************** hashing.c Hashing helper classes. ***************************************************************************/ #include "hashing.h" #include #include #include namespace util { //************************************************************************** // INLINE FUNCTIONS //************************************************************************** namespace { //------------------------------------------------- // char_to_hex - return the hex value of a // character //------------------------------------------------- constexpr int char_to_hex(char c) { return (c >= '0' && c <= '9') ? (c - '0') : (c >= 'a' && c <= 'f') ? (10 + c - 'a') : (c >= 'A' && c <= 'F') ? (10 + c - 'A') : -1; } constexpr uint32_t sha1_rol(uint32_t x, unsigned n) { return (x << n) | (x >> (32 - n)); } inline uint32_t sha1_b(uint32_t *data, unsigned i) { uint32_t r = data[(i + 13) & 15U]; r ^= data[(i + 8) & 15U]; r ^= data[(i + 2) & 15U]; r ^= data[i & 15U]; r = sha1_rol(r, 1); data[i & 15U] = r; return r; } inline void sha1_r0(const uint32_t *data, std::array &d, unsigned i) { d[i % 5] = d[i % 5] + ((d[(i + 3) % 5] & (d[(i + 2) % 5] ^ d[(i + 1) % 5])) ^ d[(i + 1) % 5]) + data[i] + 0x5a827999U + sha1_rol(d[(i + 4) % 5], 5); d[(i + 3) % 5] = sha1_rol(d[(i + 3) % 5], 30); } inline void sha1_r1(uint32_t *data, std::array &d, unsigned i) { d[i % 5] = d[i % 5] + ((d[(i + 3) % 5] & (d[(i + 2) % 5] ^ d[(i + 1) % 5])) ^ d[(i + 1) % 5])+ sha1_b(data, i) + 0x5a827999U + sha1_rol(d[(i + 4) % 5], 5); d[(i + 3) % 5] = sha1_rol(d[(i + 3) % 5], 30); } inline void sha1_r2(uint32_t *data, std::array &d, unsigned i) { d[i % 5] = d[i % 5] + (d[(i + 3) % 5] ^ d[(i + 2) % 5] ^ d[(i + 1) % 5]) + sha1_b(data, i) + 0x6ed9eba1U + sha1_rol(d[(i + 4) % 5], 5); d[(i + 3) % 5] = sha1_rol(d[(i + 3) % 5], 30); } inline void sha1_r3(uint32_t *data, std::array &d, unsigned i) { d[i % 5] = d[i % 5] + (((d[(i + 3) % 5] | d[(i + 2) % 5]) & d[(i + 1) % 5]) | (d[(i + 3) % 5] & d[(i + 2) % 5])) + sha1_b(data, i) + 0x8f1bbcdcU + sha1_rol(d[(i + 4) % 5], 5); d[(i + 3) % 5] = sha1_rol(d[(i + 3) % 5], 30); } inline void sha1_r4(uint32_t *data, std::array &d, unsigned i) { d[i % 5] = d[i % 5] + (d[(i + 3) % 5] ^ d[(i + 2) % 5] ^ d[(i + 1) % 5]) + sha1_b(data, i) + 0xca62c1d6U + sha1_rol(d[(i + 4) % 5], 5); d[(i + 3) % 5] = sha1_rol(d[(i + 3) % 5], 30); } inline void sha1_process(std::array &st, uint32_t *data) { std::array d = st; unsigned i = 0U; while (i < 16U) sha1_r0(data, d, i++); while (i < 20U) sha1_r1(data, d, i++); while (i < 40U) sha1_r2(data, d, i++); while (i < 60U) sha1_r3(data, d, i++); while (i < 80U) sha1_r4(data, d, i++); for (i = 0U; i < 5U; i++) st[i] += d[i]; } } // anonymous namespace //************************************************************************** // CONSTANTS //************************************************************************** const crc16_t crc16_t::null = { 0 }; const crc32_t crc32_t::null = { 0 }; const md5_t md5_t::null = { { 0 } }; const sha1_t sha1_t::null = { { 0 } }; //************************************************************************** // SHA-1 HELPERS //************************************************************************** //------------------------------------------------- // from_string - convert from a string //------------------------------------------------- bool sha1_t::from_string(const char *string, int length) { // must be at least long enough to hold everything memset(m_raw, 0, sizeof(m_raw)); if (length == -1) length = strlen(string); if (length < 2 * sizeof(m_raw)) return false; // iterate through our raw buffer for (auto & elem : m_raw) { int upper = char_to_hex(*string++); int lower = char_to_hex(*string++); if (upper == -1 || lower == -1) return false; elem = (upper << 4) | lower; } return true; } //------------------------------------------------- // as_string - convert to a string //------------------------------------------------- std::string sha1_t::as_string() const { std::ostringstream buffer; buffer.fill('0'); buffer << std::hex; for (auto & elem : m_raw) buffer << std::setw(2) << unsigned(elem); return buffer.str(); } //------------------------------------------------- // reset - prepare to digest a block of data //------------------------------------------------- void sha1_creator::reset() { m_cnt = 0U; m_st[0] = 0xc3d2e1f0U; m_st[1] = 0x10325476U; m_st[2] = 0x98badcfeU; m_st[3] = 0xefcdab89U; m_st[4] = 0x67452301U; } //------------------------------------------------- // append - digest a block of data //------------------------------------------------- void sha1_creator::append(const void *data, uint32_t length) { #ifdef LSB_FIRST constexpr unsigned swizzle = 3U; #else constexpr unsigned swizzle = 0U; #endif uint32_t residual = (uint32_t(m_cnt) >> 3) & 63U; m_cnt += uint64_t(length) << 3; uint32_t offset = 0U; if (length >= (64U - residual)) { if (residual) { for (offset = 0U; (offset + residual) < 64U; offset++) reinterpret_cast(m_buf)[(offset + residual) ^ swizzle] = reinterpret_cast(data)[offset]; sha1_process(m_st, m_buf); } while ((length - offset) >= 64U) { for (residual = 0U; residual < 64U; residual++, offset++) reinterpret_cast(m_buf)[residual ^ swizzle] = reinterpret_cast(data)[offset]; sha1_process(m_st, m_buf); } residual = 0U; } for ( ; offset < length; residual++, offset++) reinterpret_cast(m_buf)[residual ^ swizzle] = reinterpret_cast(data)[offset]; } //------------------------------------------------- // finish - compute final hash //------------------------------------------------- sha1_t sha1_creator::finish() { const unsigned padlen = 64U - (63U & ((unsigned(m_cnt) >> 3) + 8U)); uint8_t padbuf[64]; padbuf[0] = 0x80; for (unsigned i = 1U; i < padlen; i++) padbuf[i] = 0x00; uint8_t lenbuf[8]; for (unsigned i = 0U; i < 8U; i++) lenbuf[i] = uint8_t(m_cnt >> ((7U - i) << 3)); append(padbuf, padlen); append(lenbuf, sizeof(lenbuf)); sha1_t result; for (unsigned i = 0U; i < 20U; i++) result.m_raw[i] = uint8_t(m_st[4U - (i >> 2)] >> ((3U - (i & 3)) << 3)); return result; } //************************************************************************** // MD-5 HELPERS //************************************************************************** //------------------------------------------------- // from_string - convert from a string //------------------------------------------------- bool md5_t::from_string(const char *string, int length) { // must be at least long enough to hold everything memset(m_raw, 0, sizeof(m_raw)); if (length == -1) length = strlen(string); if (length < 2 * sizeof(m_raw)) return false; // iterate through our raw buffer for (auto & elem : m_raw) { int upper = char_to_hex(*string++); int lower = char_to_hex(*string++); if (upper == -1 || lower == -1) return false; elem = (upper << 4) | lower; } return true; } //------------------------------------------------- // as_string - convert to a string //------------------------------------------------- std::string md5_t::as_string() const { std::ostringstream buffer; buffer.fill('0'); buffer << std::hex; for (auto & elem : m_raw) buffer << std::setw(2) << unsigned(elem); return buffer.str(); } //************************************************************************** // CRC-32 HELPERS //************************************************************************** //------------------------------------------------- // from_string - convert from a string //------------------------------------------------- bool crc32_t::from_string(const char *string, int length) { // must be at least long enough to hold everything m_raw = 0; if (length == -1) length = strlen(string); if (length < 2 * sizeof(m_raw)) return false; // iterate through our raw buffer m_raw = 0; for (int bytenum = 0; bytenum < sizeof(m_raw) * 2; bytenum++) { int nibble = char_to_hex(*string++); if (nibble == -1) return false; m_raw = (m_raw << 4) | nibble; } return true; } //------------------------------------------------- // as_string - convert to a string //------------------------------------------------- std::string crc32_t::as_string() const { return string_format("%08x", m_raw); } //------------------------------------------------- // append - hash a block of data, appending to // the currently-accumulated value //------------------------------------------------- void crc32_creator::append(const void *data, uint32_t length) { m_accum.m_raw = crc32(m_accum, reinterpret_cast(data), length); } //************************************************************************** // CRC-16 HELPERS //************************************************************************** //------------------------------------------------- // from_string - convert from a string //------------------------------------------------- bool crc16_t::from_string(const char *string, int length) { // must be at least long enough to hold everything m_raw = 0; if (length == -1) length = strlen(string); if (length < 2 * sizeof(m_raw)) return false; // iterate through our raw buffer m_raw = 0; for (int bytenum = 0; bytenum < sizeof(m_raw) * 2; bytenum++) { int nibble = char_to_hex(*string++); if (nibble == -1) return false; m_raw = (m_raw << 4) | nibble; } return true; } /** * @fn std::string crc16_t::as_string() const * * @brief ------------------------------------------------- * as_string - convert to a string * -------------------------------------------------. * * @return a std::string. */ std::string crc16_t::as_string() const { return string_format("%04x", m_raw); } /** * @fn void crc16_creator::append(const void *data, uint32_t length) * * @brief ------------------------------------------------- * append - hash a block of data, appending to the currently-accumulated value * -------------------------------------------------. * * @param data The data. * @param length The length. */ void crc16_creator::append(const void *data, uint32_t length) { static const uint16_t s_table[256] = { 0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7, 0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef, 0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6, 0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de, 0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485, 0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d, 0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4, 0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc, 0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823, 0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b, 0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12, 0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a, 0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41, 0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49, 0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70, 0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78, 0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f, 0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067, 0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e, 0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256, 0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d, 0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405, 0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c, 0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634, 0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab, 0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3, 0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a, 0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92, 0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9, 0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1, 0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8, 0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0 }; const auto *src = reinterpret_cast(data); // fetch the current value into a local and rip through the source data uint16_t crc = m_accum.m_raw; while (length-- != 0) crc = (crc << 8) ^ s_table[(crc >> 8) ^ *src++]; m_accum.m_raw = crc; } } // namespace util